Research On Security Enhancement Method Of YAFFS2 File System Based On Transparent Encryption And Decryption

Nowadays,the application of mobile intelligent terminals is more and more extensive,and many important files and data are stored in the form of electronic documents on the device,which brings a lot of security problems at the same time.At present,some file encryption software has appeared on the security market of mobile intelligent terminals.However,these encryption softwares mainly use user-based encryption mechanisms,and the security factor is not high and the operation process is cumbersome.The encryption technology used in this paper encrypts and decrypts the files on the NAND Flash from the YAFFS2 file system layer to realize the chunk-level transparent encryption and decryption.When the user opens or edits the specified file,the system will automatically encrypt the unencrypted file and automatically decrypt the encrypted file.Compared with other encryption methods,the method has higher security factor,finer granularity and higher efficiency.The method implements the transparent encryption and decryption function at the file system layer,and the technology has universality,and can be combined with the upper layer framework,and is extended to the platform technology application to the illegal acquisition of short messages,photo video leakage protection,and illegal payment protection.This paper mainly studies the workflow of YAFFS2 file system and the principle of AES encryption algorithm.Based on the characteristics of YAFFS2 file system read and write files,a method of security enhancement of YAFFS2 file system is designed.The AES encryption algorithm is used as a tool in the YAFFS2 file system layer.Transparent encryption and decryption operations are performed on specified files and directories to improve the security of the file system and effectively protect the user's data.The paper also tests the designed YAFFS2 file system security protection method.It can be seen from the test results that the YAFFS2 file system security enhancement method based on transparent encryption and decryption is effective,and the work is stable and reliable,and meets the design requirements and objectives.Finally,summarize and analyze the work done in this paper and point out the shortcomings,look forward to the future,and point the way for the next step.